Duplex boiler-gage



c. H. AND w. R. JOHNSON.

DUPLEX BOILER GAGE.

Patented Apr. 5, 1921.

APPLICATION FILED Jun 1.1920.

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HWE/VTOR i. [2/ 1/ \i F /7 "i IIIII CHARLES HANLEY JOHNSON A1\TD WILLIAM RUSSELL JOHNSON, or JERSEY any, NEW JERSEY' DUELEX BQILEB-G-AGE.

Specification of'Letters Patent. Patented Apr. 5, 121

Application filed July 1, 1920. Serial No. 393,258.

To all 'w/wmtt may conccr-n:

Be it known that we, CrrARLns H. JOHN- sozt and lVILLLiai RUssnLL JonNsoN, both citizens of the United States, and residents 7 of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and Improved Duplex Boiler-Gage, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved boiler gage for use on stationary or locomotive boilers, and arranged to remain in service even in case one of the glasses should break. f

Another object is to allow convenient replacing of a broken glass without interrupting the use of the gage.

ll ith these and other obj invention consists of certain novel features of construction, as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference-indicate corresponding parts in all theyiews.

Figure 1 is a front elevation of the improved duplex boiler gage with parts shown in section;

Fig. 2 is a side elevation of the same; and

3 is a sectional plan view of the same on the line 33 of Fig. 2.

The body 10 of the duplex boiler is preferably made of metal and is provided with two compartments 11 and 12 separatet by a partition 13 common to both compartments. The sides of the compartments 11 and 12 are formed by glass plates 1 1 and 1.5 sufficiently strong to withstand any boiler pressure, and the outer faces of the plates 1% and 15 are provided with vertically disposed refiecting ribs 16 and 17 to permit the user to readily see the levels of the water in the compartments 11 and 12. The

plates 1 1 and 15 are fastened in place by covers 18 and 19 fastened by bolts 20 and 21 to the body 10.

In practice, the sides of the body10 are provided with rabbets 22, 23 and similar rabbets 2 25 are formed on the inner faces of the covers 18 and 19 to receive the glass plates 14 and 15 with a view to securely hold the plates in position. Suitable gaskets 26 and 27 are arranged in the rabbets 22,

ects in view, the

23, and similar. gaskets 28, 29 are arranged in the rabbets 2e, 25 to render the gage steam and water tight. The gaskets 26, 21 are preferably made of copper, while the gaskets'28, 29 are preferably made of asbestos or a similar material. It is under stood that when the covers. 18. and 19 are screwed in place on the body 10 then the gaskets 26, 2'7, 28 and 29 are compressed to insure water and steam-proof joints between the body 10 and the plates 14 and 15.

The upper ends of the compartments 11 and 12ers provided with steam inlet pipes 30, 31 having valves 32, 33 adapted to be opened and closed independently whenever it is desired to do so. 'Normally the valves and 33. are, however, in open position. The pipes and 31 are both connected with a valve ea connected by a pipe owith the boiler 36 at the steam compartment thereof, and the valve 3 1 is likewise normally open to! allow steam to pass from the boiler through the pipe 35 and valve 3 1 and pipes 30, 31 and their valves 32, 33 into the upper ends of the two compartments 11 and 12.

The lower ends of the compartments 11 and 12 are provided with water inlet pipes 40, -11 provided with valves 12, 43 and both connected-with a single valve 4A; connected by a pipe with the boiler 36 at the water compartment thereof. The valves 44: and 12 are normally open so that water from the water compartment of the boiler passes into the lower portions of the compartments 11 and 12 to permit of viewing the water level of the boiler independently in'both compartments 11 and 12 through the corresponding glass plates 14: and 15.. Itwill be noticed that by closing the valves 34 and 1a both the steam and the water in the boiler 36 are cut ofi from the gage. In case one of the plates 14; or 15 breaks or a leaky joint is formed at either compartment then this particular compartment can be cut out by correspondingly closing the valves 32, 42 or 33, 13'. a

When using the gage on a locomotive boiler, the body 10 has its sides converging in the boiler can be seen from either side of the gage and by providing the two con1-.

partnients the gage can remain 1n service even if one of the glass plates i l or it breaks. t is understood that in case the glass plate let or 15 breaks, the corresponding valves 32, 42 or 33, 43 are closed toshut off the steam and water from the corresponding compartment. The broken glass plate can now be removed and replaced by another without interfering with the use of the glass'gage owing to the'fact that the other compartment is still in service.

It will also be noticed that a gage constructed in the manner described is exceed 7 ingly strong and durable and is practically sate against blowing out, as is so frequently the case with the ordinary glass tube gages heretotore used. it will iurther oe noticed that the danger of falling glass from a plates in position, and independent upper and lower valved gage connections at the upper and lower ends of the said compartments.

'2. A duplex boiler gage, comprising a I body provided with two compartments havmg a partition in common and having dia-phanous side plates and covers holding the plates in position, independent upper and lower valved gage connections at the upper and lower ends of the said compartments, and valved boiler connections connecting with the said valved gage connections.

3. A duplex boiler gage, .comprising a body provided with two compartments hav- 

